The project logo (logo.png) is based off this image:
https://flickr.com/photos/internetarchivebookimages/14597926007
Which is from this public domain book:
https://archive.org/details/39002087752128.med.yale.edu

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The other logos are all freely licensed as follows:

Open Source Hardware Logo - CC-SA 4.0 International
https://www.oshwa.org/open-source-hardware-logo

Rust Logo - CC-BY 4.0 International
https://www.rust-lang.org/policies/media-guide

GPLv3 logo - Public Domain
https://www.gnu.org/graphics/license-logos.html
